Dictionary  plu•to•nismPronunciation: (plOOt'n-iz"um), [key] —n. Geol. 1. the intrusion of magma and associated deep-seated processes within the earth's crust. 2. (often cap.) the disproven theory that all rocks formed by solidification of a molten mass, promulgated by Scottish geologist James Hutton (1726–97). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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